Can you use the tac command in Terminal?

I'm trying to search a large file in reverse ord开发者_Go百科er from the command line (using terminal). I found the tac command: http://clifgriffin.com/2008/11/25/tac-and-reverse-grep/

tac is the inverse of cat. However, when I try to use the tac command in terminal, it says that command doesn't exist. Is there a way I'd be able to use tac in terminal? What are some other fast ways to search a file from the end via the command line?

The MacOs version of tail support the -r ("reverse") option, and defaults to displaying the entire file from the end. So tail -r filename should be exactly equivalent to tac filename.

Or, you could try building tac yourself from the source code. It's part of the GNU coreutils package.

It's easy using OSX Homebrew:

brew install coreutils

Then it's available as gtac (as in GNU tac), for example:

# Find and parallel copy all files in reverse order
find . -print | gtac | parallel copy "{}" destination/